6b. Power Balance Test: Notes

NOTE: Do not replace the fuel injectors based only on the results of the Power Balance Test. Always verify the fuel delivery system, the high pressure oil system, the fuel injector electrical system, and the base engine system functions are operating correctly.

NOTE: Before carrying out the Power Balance Test, allow the engine to stabilize at the temperature necessary to recreate the symptom. Access the PCM and record the freeze frame data. The freeze frame data contains information which can be used to recreate original conditions that caused the symptom. Refer to FREEZE FRAME DATA for more information.

NOTE: The contributing power cylinders that immediately follow the non-contributing power cylinders in the firing order may be affected. The affected power cylinders may not be able to fully recover the crankshaft speed, causing them to display below average contributing power cylinders and to be incorrectly identified as the non-contributing power cylinder. Therefore only the cylinders that deviate the most from the average should be identified as the non-contributing power cylinder. Single or inconsistent non-contributing power cylinder traces may be caused by a natural variation in the crankshaft speed and should be ignored.

NOTE: Vane Sweep can occur during a Power Balance Test. Refer to POWERTRAIN CONTROL SOFTWARE , VANE SWEEP for additional information. Allow the vane sweep to complete.

NOTE: Disregard any DTCs set as a result of the Power Balance Test.

NOTE: If the fuel injectors have been removed or the high pressure oil system has been repaired, it may be necessary to operate the vehicle and carry out a minimum of 12 short, high demand acceleration cycles to purge air from the high pressure oil system.

NOTE: If the engine runs rough between 1,200 RPM and 2,300 RPM, follow the Check Valve Operation test before carrying out the Power Balance Test.

NOTE: If the engine does not start during this procedure verify the batteries are fully charged, plug in the block heater and cycle the ignition several times to activate the glow plugs.

NOTE: If the vehicle is equipped with a power take-off (PTO) system or auxiliary idle control, it must be turned off to carry out the Power Balance Test.

NOTE: Verify the engine oil level and quality. Refer to CHECK ENGINE OIL LEVEL .